Hammer-drill.



D. SPEHAR.

HAMMER DRILL- APPLICATION FILED MAY 9. I911.

Patented Oct. 23, 1917.

D. SPEHAR.

HAMMER DRILL.

APPLICATION FILED MAY 9. 1917.

1,244,386. Patented Oct. 23,1917.

3 SHEETSSHEET 2.

WITNESSES V V24 F ATTORNEYS D. SPEHAR.

HAMMER DRILL. APPLICATION FILED ulna. I917.

a SHEETSSHEET a,

Paten ted Oct INVENTOH #19,;

WIT/158858 4 TTORNEYS T OFFICE- To all whom it may concern: 3 V I,

Be it kno -nthat I, DAMISPEHAR, a citizen of the United States, -and a resident of Miami, in the;,oountynffiila and State. Of Arizona, have invented an, Improvement in- Hammer-Drills, of-Whichtheiollow-ing is a speeifieationu m, 5

One of {the pnineipal objects 10f my present -in vention ,is' to provide anev improved handi prospecting drill, {of {the 'harnmertype, so constructed as to he eollapsible whereby to be placedin a handbag pr ,satohel ior transportation, ,the drillheing, designed gear eti'oularlfy :for use in quarry and mine, ,WQrk, Another object of the invention is to pm.

vid'efla drill ;of the class described having improved means for effecting ,a deliveryof blows by the hammenqan'd haying improved arrangement, for effeoting arotary motion of the drill bit,

A fur-taller-.olo,ject resides n improve; ment an the construction and '',arrangement ofthe detailed partsioflthe gdrill.

With these and othelj ohjeets ,in yijew which will become Apparent vas the description proceeds,the,intention resides in the construetion, oombination and arrangeinen't of parts hereinafter more fully describedand claimed, and illustrated in the aoeom panying drawings, in Which like oharacters ,of reference indicate ,like parts (throughout the several figures, of which Figure 1 represents a :s1de eleVational- View of a hand drill constructed according.

to my present invention,

- Fig, 2 represents 12 n edge elevational View thereof.

, Fig. 3 represents 2 a; -yiew in-section {taken 7 horizontally (on the; gplane indicated by the line-33 of Fig.1. 1

fFig; & 1represents a yiew in perspective ofone of the dogs for holding the ratchet;

head 1 against reverse rotation.

Fig. 5 represents ;an enlarged sectional View taken horizontally 1,011 the plane indicatedby theline-v55, of/Fig; 1.

Fig.6 represents an enlarged vertical sectional view taken through the lower portion of the -,casing 1 showingythe, hammer and the V in lll. When the spi l 6 i moved-upanviland associated parts. I Fig. '7 represents a VIEW s1m1larto Fig; 6

showing the parts in elaeration, the casing tion (of the drill, :the, iIltQIRal aITtS being 3 7 Siieifieationof Letters'lhteiit."

Fig. E Q-I Ql DiESGILtSfiI yiew section horizontally on the plane indioatedby the 1 11 9+9 of Fig,

v a V p I raeeneea oet. 23}, 19 1?. y'ApplioationfiledMay9, 1917. Seria1No.167,522.

10 represents a y ew in seq ion n the planelindicated by the line 101,1Ql,o,f

Fig. 16;, looling iinthe direction indicated hythearrows 1 aiepre n s 1 n w t on tak n.

' on th ipl n nd t y the linellfill g j Fig. ,.-.1,1ooking e cl i ctien ndie d by he irewsa, i

' Fig-123 is etienal d ta l of t eflen rat ng Whee 0 the l iel e 12of Fig: 8.

e e ing more p rticnla ily t hi draw,-

in gi-the drill ineludesa ,eylindrioal teasin Q5 wit-11in hmh i uarr ged t r. rec pr ca ion a shank I or spindle ,6 of the drill, snehYspinclle eingw orme 'et t l w 161 ith a ring to 01 is 'held.

Th -1 'r' per:end of a ing .15, i c w threadedto r ceiv he interna y th eaded, 'fla-ngeporton f a cap 11. This? cap is equipped withthe set screws-12 for securing it; detaohably upon the oasing Elie has polygonal? nut 13 "formed in tegral1y h rewith wh reby a iwrench may Joe need in turning ,the cap onto a'nd elf of thenpper end of the e sing; ll rm d in egral y w th the nut 1 3,101 elded thereon, is a pairof spaced standards 14 1: between which the pperend ofthe s pindle ,6 pr'ojeots thespinrlle being squared and ,-,extendin g through a qu red epen ng in he cap.;. hereby t beheld against rotation. llhisgspindle end is iproyided with the reel; teeth 1 5 adapted, ote engaged by the roller t eth 1. .6 ojfla drive wheel 17 whereby to periodieallyiliit the spin le 1.6 againstithe ac ion of the-com pou d spring -1 This comp und fip l lg consists/of the nner fit-DdiQLWer-spiral springs mounted upon-{the} spindle 6 i and interposed e e he=hammer, orihead fiend-the cas Wardly the :springs are, placed under -eo1n. pressioni o r r Theidriv whee l is moun edio en xl Q :19 which i li rnal din bu h n 20 :c rri d at th outer 7 nd ge ms-42, formed; a th d ppe {ends 1 eis a dardfi 14' and which project laterally from said standards. keyed thereon the inner member 22 of a crank handle, the outer member 23 of which is provided with a handle 24: and is adjustably mounted upon the inner member 22 by a bolt and slot connection indicated generally at 25. l r r Carried on the cap 11 is a casing, indicated generally at 26, whichcasing incloses the drive wheel 17 and the standards 14 and associated parts. The casing includes the I side .plates 27, which at their lower ends may be welded or otherwise fixed to the cap 11. The edges of the plates-are bridged, and the housing thus'closed' bythe strap irons 28, which at their lower endsare secured to the cap through the medium of screws 29, the upper ends of the strap irons being connectedtogeth'er by a pin 30' on which a handlehl is positioned. The casingtakes the contour shown in the drawings, the

7 handle 31' being arranged at the uppenend of the drill in convenient position to be held in one of the hands of the operator, while thegwheelfli is rotated by the other hand 7 through" manipulation of the crank arm guides 85. The'plates' 34 constituting each key are slotted and through them and through a registering opening in web 32 extendsa bolt 36 which may be tightened for securing or clampingthe plates 34c against web 32. These plates normally, at their outer ends, extend into openings cut in the floor of the rim or channel member 33 so as to prevent accidental removal of 5 this rim from the wheel. If it is desired'to remove therim' for any reason the bolts '36 are loosened, the plates 3% moved in'wardlyto ward the hub of the wheel, whereby to disengage the rim, and the latter is thenfree to be taken off. This rim carries the transversely arranged roller teeth 16 which, as hereinbefore stated, coiiperate with the rack teeth 15 in lifting the spindle 6 against the tension of the compound spring 18. The roller teeth are arranged, as indicated in Fig. 8, in a plurality of series, suitable distances occurring between the seriesto allow movement of the spindle 6 downwardly under the tension of the compressed springs, after the last roller of a'series leaves the rack teeth and before the first roller of the succeeding series engages with the rack teeth. Thus itwill be understood that as One end of the axle 19 has.

neageee the wheel is rotated the spindle 6 will, in rapid succession, be alternately lifted against the tension of the spring and then released whereby to deliver a blow to the anvil 8. This alternatev lift and release of the spindle will occur three timesto each revolution of the drive wheel, so that the action will be relatively rapid, and a relatively great number of blows during any given period will be delivered to the anvil 8. At the upper ends of the standards 14 and between them is arranged a-fianged roller 37 between the flanges of which the upper end'of the spindle 6 is guided. This rolleris mounted on a cylindrical bushing 88 (see Fig. 5), which in turn is mounted-on a pin 39 carried by theuprights, as shown.

The stem 9, together with the anvil S, is reclprocably mountedrel'atively to the body of thedrill, ina ratchet head indicated generally at 40. This ratchet head is rotatablewithin the lower portion ofthe casing 5,'and 1s machined from one piece of metal preferably, and includes an upper tapered porlZlQIL 41 which is provided with parallel inclined or spiral ratchetshoulders d2.

Adapted to cooperate with theseratchet shoulders, in effecting an intermittent step by step rotatlon of the drillstem 9, is an arm #3 pivotally mounted at its upper end within a recess 4a in hammer'i', on a pin 45. The-arm at its lower end carries a lug e6 WlllCll engages with the successive shoulders 42 as the spindle 6reciprocatesin effecting a step by step rotation of the ratchet head. The stem 9 is provided with a longitudinal key jway' l7 which rides over a key or lug 48 formed integrally with the ratchet head and prQ ecting into the bore thereof,1whereby the stem will be rotated as the ratchet head is rotated, and at the same time will be allowed to reciprocate relatively to the ratchet head. The arm d3 at its'upper end 1s equipped on one side with a leaf spring 48 which at its upper end is engaged in a clip 49 which acts as the bearing for one end-of a relatively small "coiled spring in- I terposed between the clip 49 and the hinge element 51 secured by means of a screw 52' to the base of the recess-44 formed in the hammer 7. This hinge element carriesthe' pin or pintle 45 on which the arml is pivot'ally mounted. The hinge element also acts to secure againstthe floor of the recess, a spring 58 which is arranged on the opposite side of arm 43 from spring 48 and which cooperates with the last-named spring in normally tending to move the arm toward the center of the casing. 'By having the arm thus spring tensioned it will be forced toward the center of the casing whereby to always be in position to properly engage with one of the inclined shoulders uponthe downward stroke of the spindle 6. An opening at 54:, allowing access to the arm 43 and as 7. I i I this opemng 1s normally closed it Sllll'r able plate 55.

"The vel? e f basins: s d sed y a cap threadedlin'to place and upon which cap the ratchet head rotatably bears, This cap has a reduced portion 57 into which the lower reduced end ofthe ratchet head projects. The lower extremity of the ratchet head is externally threaded for receiving a locking nut 58, as shown. Thebodyportion of the ratchet head within the cap '56 is reduced and is formed with a series of ratchet teeth 59, with which the'dogs 60 (see Fig. 3) cooperate in preventing reverse rotation of stem 9. Each of these dogs tapers toward its inner end and is beveled to form a knife edge 61 engaging in a channel formed in a lug 62 which projects from the inner.

surface of cap 56. The dog is provided with a slot 63 therein through which the free end of a leaf spring S-l engages for retaining the dog in place. The other end of the spring is suitably secured to the cap 56. Between the dog and the adjacent wall of the cap is arranged a coiled spring 65 which bears the dog outwardly to engage with the ratchet teeth 59. Any desired number of these dogs may be utilized, the arrangement shown involving the use of two of the dogs arranged at diametrically opposed points with respect to the ratchet head 4C0. As the ratchet head rotated, carrying with it the stem 9, the dogs engage in the succeeding rack teeth and effectually prevent reverse rotation of the ratchethead.

On the lower end of the stem 9 is mounted a hexagon drill holder 66 in which the drilling tool may be held. This holder is split and is equipped with the U-bolts 67 which at their ends project through the straps 68 and are provided with nuts 69 which may be tightened into place for binding the tool holder about the shank of the tool. The tool holder is fitted on the lower end of the stem 9 by means of a key 70 and a set screw 71 which is turned into engagement with the stem for effectually binding the tool holder on the stem.

In operation, the drill is supported in one hand of the operator and the other hand is used to rotate the drive wheel for effecting a movement of thedrill shank into position for compressing the springs, and then releasing the shank, as already set out, whereby blows will be delivered with great rapidity against the anvil 8 and imparted through the stem 9 to the drill bit or tool held in the drill holder 10. The stem 9 will travel up and down relatively to the ratchet head, through a relatively small path of movement, estimated in the finished tool as being about 1-} or 2 inches. As the spindle reciprocates the ratchet head and with it the stem and drill are automatically rotated through the step by step movement already described, The path offreciprocation o f the hammer 7 is greater in length than. the p as; of r:e,cipi",oea tion of anvil 8, so that the full force of springs will be exerted in delivering ablow tothe anvil asthe hammerunder the force of the springs is thrown against the any il when the spindle released. 'It may be noted th'atthe lower portion of thearnrii, e ll t e .1 s. s6 b n g ins ad. r ee: ported laterlally'by oneof thewallsjof the opening 54, cut in the casing 5, so that the lateral strain imparted to the armineffect: ing the step by step rotation of the ratchet head will be taken up by the casing and hence the arm will not become fractured or bent. One particularly noteworthy advantage accruing to the invention is the fact that the drill may be disassembled so as to be readily packed in a grip or suit case. To effect the result the set screws 12 which bind the cap 11 onto the casing, are loosened and the cap is then unscrewed carrying with it the standards 14 and the housing 27 together with the drive wheel, and also carrying the shank 6 and the compound spring together with the hammer 7. The shank may then be disengaged by drawing it outwardly from the casing 27. The stem carrying the anvil 8, and the ratchet head may then be removed from the casing by unscrewing the lower cap 56. Thus the parts may be disassembled and compacted into a relatively small space for convenience in transportation.

l/Vhile I have described what I now believe to be the preferred embodiment of my invention, I may desire to make such changes in the construction, combination and ar- ,rangement of parts thereof, as do not depart from the spirit of the invention and the scope of the appended claims.

I claim:

1. In a drill, a spindle, a drive wheel for operating the spindle, said drivewheel including a central web portion, a rim sub-' stantially U-shaped in cross section mounted oircumferentially on the web portion, teeth carried by the rim, keys adjustable radially of the web portion and mounted thereon and adapted to engage in recesses cut'in the rim, and means for securing the keys in adjustable position whereby to detachably retain the rim in position on the web portion.

2. A drill, including a reciprocating spin; dle, a wheel for driving the spindle, said wheel including a central web portion, a de tachable channel rim and teeth carried by the channel rim, and means mounted upon said web portion and movable outwardly thereon to detachably engage the channel rim and hold it in place.

3. In a drill, a ratchet head, a reciprocating member, an arm in cooperative relation to the ratchet head to impart rotation thereto, a clip secured to the reciprocating memher, a leaf spring at one side of the arm and engaging the said clip, a hinge element se cured to the reciprocating member and having the said arm pivoted thereto, and a coil spring interposed between the hinge element and the clip and disposed on the side of the arm opposite that engaging the leaf spring.

4. In a drill casing having a longitudinal opening in a side thereof, a ratchet head mounted in the casing, a reciprocating member Within the casing, an arm connected to the reciprocating member and engaging the ratchet head to effect rotation thereof, said arm operating in the longitudinal opening of the casing and maintained in normal posi- 15 tion thereby, and means for preventing reverse rotation of the ratchet head.

DANE SPEHAR. Witnesses:

STEVE AsoN, CHAS. GUNDEROTH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

